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Displaying 601 - 625 of 2736

Gas-phase broadband spectroscopy using active sources: progress, status, and applications

January 1, 2017
Author(s)
Kevin C. Cossel, Eleanor M. Waxman, Ian A. Finneran, Geoffery A. Blake, Jun Ye, Nathan R. Newbury
Broadband spectroscopy is an invaluable tool for measuring multiple gas-phase species simultaneously. In this work we review current applications for broad-band spectroscopy. We discuss components of broad-band spectroscopy including light sources

Automation of Piston Gauge Calibration Services Phase I Results

December 29, 2016
Author(s)
Katie M. Schlatter, Julia Scherschligt, John S. Quintavalle, Robert G. Driver, Christina D. Cross
This report documents efforts to date to automate Piston Gage Calibration Services. This report includes an overview of the project, results for Phase I Implementation efforts, and a look ahead to Phase II. Phase I Measures and Deliverables are based on

Spectral dependence of carrier lifetimes in silicon for photovoltaic applications

December 21, 2016
Author(s)
John F. Roller, Yu-Tai Li, Mario Dagenais, Behrang H. Hamadani
Charge carrier lifetimes in photovoltaic-grade silicon wafers were measured by a spectral-dependent, quasi-steady-state photoconductance technique. Narrow bandwidth LEDs were used to excite excess charge carriers within the material, and the effective

Certification of New Standard Reference Material 2806b Medium Test Dust in Hydraulic Oil

December 19, 2016
Author(s)
Robert A. Fletcher, Nicholas W. Ritchie, David S. Bright, James J. Filliben, William F. Guthrie
A new material has been certified to become Standard Reference Material (SRM) 2806b - Medium Test Dust in Hydraulic Fluid. SRM 2806b consists of a trace polydisperse, irregularly shaped mineral dust particles suspended in hydraulic fluid. The certified

Introduction to the special issue on small-angle scattering

December 19, 2016
Author(s)
Michael Gradzielski, Andrew J. Allen
This is the foreword for a Special Issue of the Journal of Applied Crystallography on Small-Angle Scattering. This special issue collects together full-length peer-reviewed research papers in association with the 15th International Conference on Small

NIST Handbook 105-4: Specifications and Tolerances for Reference Standards and Field Standard Weights and Measures, Specifications and Tolerances for Liquefied Petroleum Gas and Anhydrous Ammonia Liquid Volumetric Provers (2016 Ed.)

December 13, 2016
Author(s)
Georgia L. Harris, Val R. Miller
These specifications and tolerances are recommended as minimum requirements for standards used by state and local weights and measures officials and others in the regulatory verification of meters used in quantity determination of pressurized liquid

Vector-Network-Analyzer Calibration Using Line and Multiple Coplanar-Waveguide Offset Reflects

December 9, 2016
Author(s)
Arkadiusz C. Lewandowski, Wojciech Wiatr, Dazhen Gu, Nate Orloff, Thomas Mitchell (Mitch) Wallis, Pavel Kabos
We present the application of our newly developed multi-reflect-thru technique to vector-network-analyzer calibration in the on-wafer environment. This technique uses a set of highly-reflective one-port devices, referred to as offset-reflects, and a single

Draft B Report on the Key Comparison CCM.P-K4.2012 in Absolute Pressure from 1 Pa to 10 kPa

December 7, 2016
Author(s)
Jacob E. Ricker, Jay H. Hendricks, Thomas Bock, Prazak Dominik, Tokihiko Kobata, Jorge Torres, Irina Sadkovskaya
This report summarizes the Consultative Committee for Mass (CCM) key comparison CCM.P-K4.2012 for absolute pressure spanning the range of 1 Pa to 10 000 Pa. The comparison was completed via calibration of a transfer standard carried out at six NMIs during

NIST Handbook 133: Checking the Net Contents of Packaged Goods (2017 Ed.)

December 6, 2016
Author(s)
Lisa Warfield, David Sefcik, Linda D. Crown
This handbook has been prepared as a procedural guide for the compliance testing of net contents statements on packaged goods. Compliance testing of packaged goods is the determination of the conformance results of the packaging, distribution, and

Electron Microscopy and Nanoscopy: Analytical

December 5, 2016
Author(s)
Vladimir P. Oleshko
The analytical electron microscope (AEM) is a transmission and/or scanning transmission electron microscope (S/TEM) which is modified to permit composition analyses using x-ray energy-dispersive spectroscopy (XEDS) and/or electron energy-loss spectroscopy

Thermographic Measurements of the Commercial Laser Powder Bed Fusion Process at NIST

December 5, 2016
Author(s)
Brandon M. Lane, Shawn P. Moylan, Eric P. Whitenton, Li Ma
Measurement of the high-temperature melt pool region in the laser powder bed fusion (L-PBF) process is a primary focus of researchers to further understand the dynamic physics of the heating, melting, adhesion, and cooling which define this commercially

Architecture for Software-assisted Quantity Calculus

December 2, 2016
Author(s)
David W. Flater
A quantity value, such as 5 kg, consists of a number and a reference (often an International System of Units (SI)unit) that together express the magnitude of a quantity. Many software libraries, packages, and ontologies that implement "quantities and units

Membrane-Based Environmental Cells for SEM in Liquids

December 1, 2016
Author(s)
Andrei A. Kolmakov
Environmental electron microscopy and Scanning Electron Microscopy (SEM) in liquids are among the most active research areas in modern electron microscopy and spectroscopy. Research interest in these techniques is broad as they are enabling the nanoscale

New Methods for Series-Resistor Calibrations on Lossy Substrates up to 110 GHz

December 1, 2016
Author(s)
Liu Song, Nate Orloff, Song Liu, Charles A. Little, Xifeng Lu, James Booth, IIja Ocket, Arkadiusz Lewandowski, Dominique Schreurs, Bart Nauwelaers
We present two new methods to perform seriesresistor calibrations on lossy substrates. Lossless calibration substrates, which are required by the traditional calibration comparison technique, are not needed. The proposed methods rely on the multiline TRL

A Planar Hyperblack Absolute Radiometer

November 14, 2016
Author(s)
John H. Lehman, Michelle S. Stephens, Malcolm G. White, Andreas Steiger, Christian Monte, Joerg Hollandt, Ivan Ryger, Mathias Kehrt, Marla L. Dowell
The absolute responsivity of a planar radiometer fabricated from micromachined silicon and having carbon nanotubes as the absorber and thermistor was measured in the visible and far infrared (free-field terahertz) wavelength range by means of detector
Displaying 601 - 625 of 2736
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